Affiliation:
1. College of Chemistry Chemical Engineering and Environment Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology Minnan Normal University Zhangzhou Fujian 363000 China
2. School of Chemistry and Chemical Engineering Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials and Devices Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Devices Guangzhou University Guangzhou Guangdong 510006 China
Abstract
AbstractElectrochemiluminescence (ECL) featuring thermally activated delayed fluorescence (TADF) properties has attracted considerable interest, showcasing their potential for 100 % exciton harvesting, which marks a significant advancement in the realm of organic ECL. However, the challenge of elucidating the precise contribution of TADF to the enhanced ECL efficiency arises due to the lack of comparative studies of organic compounds with or without efficient TADF properties. In this study, we present four carbazole‐benzonitrile molecules possessing similar chemical structures and comparable exchange energy (ΔEST). Despite their comparable properties, these compounds exhibited varying TADF efficiencies, warranting a closer examination of their underlying structural and electronic characteristics governing the optical properties. Consequently, intense ECL emission was only observed from 4CzBN with a remarkable TADF efficiency, underscoring the substantial difference in the ECL signal among molecules with comparable ΔEST and similar spectral properties but varying TADF activity.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province
Natural Science Foundation of Guangdong Province